Who vs Whom: When to Use Each (With Easy Tricks)

The who vs whom question has puzzled writers for generations. Even people who are generally confident about grammar hesitate when they encounter this pair. Part of the difficulty is that "whom" has been steadily declining in everyday English, so many speakers rarely encounter it. But in formal writing, academic papers, and professional communication, knowing when to use "who" and when to use "whom" remains a valuable skill. And the rule, once you understand it, is surprisingly straightforward.

This guide explains the who vs whom distinction clearly, teaches you a simple trick that works every time, provides plenty of examples, and discusses how modern usage is evolving.

The Core Rule

Who is a subject pronoun (like he, she, they).
Whom is an object pronoun (like him, her, them).

Use who when the pronoun is performing the action (the subject). Use whom when the pronoun is receiving the action (the object). This is the same distinction as "he" vs "him" or "she" vs "her," which is exactly what makes the following trick so effective for resolving who vs whom questions.

The He/Him Trick

This is the single most reliable method for solving who vs whom:

If you can answer the question with "he" or "she," use "who."
If you can answer with "him" or "her," use "whom."

The trick works because "who" and "he" are both subject pronouns, while "whom" and "him" are both object pronouns. Notice that both "whom" and "him" end in the letter M — that is your built-in mnemonic.

Applying the Trick

"_____ is coming to the party?"

• Answer: "He is coming." → Who

"_____ did you invite?"

• Answer: "I invited him." → Whom

"_____ wrote this report?"

• Answer: "She wrote it." → Who

"To _____ should I address the letter?"

• Answer: "Address it to him." → Whom

"_____ is responsible for this decision?"

• Answer: "He is responsible." → Who

This method works for virtually every who vs whom situation, no matter how complex the sentence.

When to Use Who

Use who when the pronoun is the subject of a verb — the one performing the action.

• "Who wants ice cream?" (He wants ice cream.)
• "Who is calling?" (She is calling.)
• "Who left the door open?" (He left it open.)
• "I know who did this." (He did this.)
• "The woman who lives next door is a doctor." (She lives next door.)
• "Who should I say is calling?" (He is calling.)
• "Who among us hasn't made a mistake?" (He hasn't.)
• "The candidate who wins the most votes will lead the council." (She wins.)

When to Use Whom

Use whom when the pronoun is the object of a verb or preposition — the one receiving the action or being acted upon.

• "Whom did you see?" (I saw him.)
• "Whom should I contact?" (Contact her.)
• "The teacher whom the students admire is retiring." (They admire him.)
• "Whom are you waiting for?" (I'm waiting for her.)
• "He is someone whom I greatly respect." (I respect him.)
• "Whom did they choose for the role?" (They chose her.)
• "The artist whom we commissioned has delivered the painting." (We commissioned him.)

Whom After Prepositions

One of the most reliable rules in the who vs whom decision: when a preposition (to, for, with, by, about, from, between, among) comes directly before the pronoun, you almost always need "whom."

• "To whom it may concern." (To him.)
• "For whom is this package?" (For her.)
• "With whom did you go?" (With him.)
• "By whom was the book written?" (By her.)
• "About whom are you speaking?" (About him.)
• "From whom did you receive the letter?" (From her.)
• "Between you and me" follows the same principle — after a preposition, use the object form.

In informal English, many of these sentences would be restructured to avoid "whom": "Who did you go with?" "Who is this package for?" These constructions end with prepositions, which was once considered poor grammar but is now widely accepted in casual writing and speech.

Who vs Whom in Relative Clauses

Relative clauses — clauses that provide additional information about a noun — frequently present who vs whom challenges. The key is to isolate the clause and determine whether the pronoun is the subject or object within that clause.

"The scientist who discovered the element received the prize."

• In the clause "who discovered the element," "who" is the subject (she discovered it). → Who is correct.

"The scientist whom the committee honored has published a new study."

• In the clause "whom the committee honored," "whom" is the object (the committee honored him). → Whom is correct.

"She is the friend who always helps me."

• "Who" is the subject of "helps." (She always helps me.) → Who is correct.

"She is the friend whom I called last night."

• "Whom" is the object of "called." (I called her.) → Whom is correct.

Tricky Cases

Interrupting Phrases

Sometimes phrases like "I think," "she believes," or "they say" interrupt the clause and create confusion about who vs whom. The trick is to mentally remove the interrupting phrase and then apply the he/him test.

"Who do you think should be promoted?"

• Remove "do you think": "Who should be promoted?" → He should be promoted. → Who is correct.

"Whom do you believe the committee will select?"

• Remove "do you believe": "Whom will the committee select?" → The committee will select him. → Whom is correct.

Whoever vs Whomever

The same rules apply to "whoever" (subject) and "whomever" (object):

• "Whoever finishes first wins." (He finishes first.)
• "Give it to whomever you choose." (You choose him.)
• "Whoever is responsible should step forward." (She is responsible.)

Modern Usage: Is "Whom" Dying?

There is considerable debate among linguists and grammarians about whether "whom" is disappearing from English. The data suggests it is declining, particularly in spoken English and informal writing. Many native speakers never use "whom" in casual conversation and feel it sounds stuffy or archaic when they encounter it.

However, "whom" remains alive and well in several important contexts:

• Formal writing: Academic papers, legal documents, and professional correspondence still use "whom" consistently.
• After prepositions: "To whom," "for whom," and "with whom" sound natural even to casual speakers.
• Fixed phrases: "To whom it may concern" and "for whom the bell tolls" are unlikely to change.
• Edited prose: Newspapers, magazines, and published books continue to observe the who vs whom distinction.

The practical advice is this: know the rule and apply it in formal writing, where it signals education and attention to detail. In casual writing and speech, using "who" in place of "whom" is increasingly acceptable and will rarely be noticed. But using "whom" incorrectly — where "who" is needed — sounds worse than not using it at all, so if you are unsure, the he/him trick is your safety net.

Practice Quiz

Fill in the blank with "who" or "whom."

1. _____ is responsible for this mess?
2. _____ did you send the email to?
3. The manager _____ hired me is leaving the company.
4. To _____ should we direct our complaints?
5. _____ do you think will win the election?
6. She is someone _____ I admire deeply.
7. _____ ate the last piece of cake?
8. The author _____ you recommended is excellent.
9. For _____ are these flowers?
10. _____ knows the answer to this question?

Answers

1. Who (He is responsible.)
2. Whom (You sent it to him.)
3. who (She hired me.)
4. whom (Direct complaints to him.)
5. Who (He will win — remove "do you think.")
6. whom (I admire her.)
7. Who (He ate it.)
8. whom (You recommended her.)
9. whom (For him.)
10. Who (She knows.)

Summary

The who vs whom distinction comes down to one question: is the pronoun the subject or the object? Who does the action (like he/she), and whom receives it (like him/her). The he/him trick — answer the question with "he" or "him" and match accordingly — gives you the right answer in every case. While "whom" is becoming less common in casual English, mastering who vs whom remains a mark of skilled, careful writing.